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Even when I close Chrome, I can see running processes of that instance in the Task Manager. If I had initiated three instances of Chrome, I could see three Chrome.exe in the Task Manager. Why aren't the processes killed when the browser is closed?

I also notice that Chrome creates a lot of cache and few times Trojans were found in Chrome's cache folder.

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Uh, maybe those Trojans are keeping Chrome open, or pretending to be Chrome? – Moshe Apr 11 '11 at 12:55
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3 Answers

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, I could see three Chrome.exe in the Task Manager. Why the processes aren't killed when the browser is closed?

They are. I can't simulate this.

As paradroid mentions - Atleast the eBay extension causes a Chrome process to remain open and adds itself to your system startup:

enter image description here

If you have this extension, I'd recommend you uninstall this. If you don't, disable all extensions and enable them one by one to find out the errant extension.

few times trojans were found in Chrome's cache folder.

I don't see how this is Chrome's fault.

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The latter is not Chrome's fault but the fault of lots of web-cache. A nice pleasure garden for trojans. – RPK Apr 11 '11 at 12:52
I have noticed that an eBay extension that I use keeps on running after Chrome is closed: chrome.google.com/webstore/detail/… – paradroid Apr 11 '11 at 12:54
@paradroid - Indeed Spybot confirms this. i.imgur.com/UhrjE.png Didn't think this was possible. – Sathya♦ Apr 11 '11 at 12:59
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A Good housekeeping rule is to clear your browser cache frequently, no matter whose browser you are using. – Moab Apr 11 '11 at 15:19
A trojan sitting in your cache can't do any harm unless it's executed somehow. Besides that, it's already on your system! You'd be better off keeping malware from getting your system in the first place instead of cleaning up afterward. – afrazier Nov 24 '11 at 16:00
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There's an option in Chrome's settings to leave it running in the background if any apps or extensions require it. Most likely you're using such an extension and this option is turned on by default. Google Cloud Print will cause this too.

Background Apps Option

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There has been problems when people have Google cloud print enabled when it leaves the Chome.exe. A quick fix would be type about:flags in the address bar and disable Print Preview.

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